For our customer Hyperion Technologies, SUA has developed a speed controller for one of their micro reaction wheels, the RW210 . SUA has supplied a custom software implementation to drive and control the rotation speed this reaction wheel. We have implemented efficient C code filtering the motor measurements and effectively controlling the wheel over a wide range of speeds. This allows the wheel to be used for long periods of time without the need for a despin manoeuvre.
The overall wheel is only 25 x 25 x 15 mm and is capable of controlling nano satellites with as little as 0.1 mN.m of torque. This is suitable for cubesats between 1 to 3 U. The RW210 can be integrated in to Attitude Determination and Control Systems which includes a star sensor to close the loop between orientation determination and control.